Gantry crane - A crane similar to an overhead crane except that the bridge for carrying the trolley or trolleys (with lifting device) is rigidly supported on two or more legs running on fixed rails or other runway.

Gondola shelving - A floor mounted shelving system utilizing cantilevered shelves extending from one or both sides of a rigid vertical back. This form of shelving is common in retail establishments due to its ease of movement and reconfiguration.

Gravity roller conveyor - A conveyor which supports the load on a series of rollers with internal ball bearing rings mounted on axles at fixed intervals in a frame. Roller conveyors come in straight sections, curved sections and in various spur and merge sections.

Gravity conveyor - Conveyor on which materials are moved by gravity or by a person, as opposed to a conveyor on which materials are moved with powered belts or rollers.